Dear Developers,
FWIW, just for the records.

Commit 2d6a3799fcda5c017f653c6e96b91964b07a7ee0 seems to be a descendant
of 0bce74d458a343e61d054c4b25d6f67bd1086f3c but the system is not
convinced of this. For more information see the attachments.

$ guix pull
Updating channel 'guix' from Git repository at
'https://git.savannah.gnu.org/git/guix.git'...
guix pull: error: aborting update of channel 'guix' to commit
2d6a3799fcda5c017f653c6e96b91964b07a7ee0, which is not a descendant of
0bce74d458a343e61d054c4b25d6f67bd1086f3c
hint: This could indicate that the channel has been tampered with and is
trying to force a roll-back, preventing you from getting the latest
updates.  If you think this is not the case, explicitly allow
non-forward updates

:~$ guix describe
Generation 119	Jun 29 2024 09:33:00	(current)
   guix 0bce74d
     repository URL: https://git.savannah.gnu.org/git/guix.git
     branch: master
     commit: 0bce74d458a343e61d054c4b25d6f67bd1086f3c

~$ guix pull --allow-downgrades
Updating channel 'guix' from Git repository at
'https://git.savannah.gnu.org/git/guix.git'...
guix pull: warning: moving channel 'guix' from
0bce74d458a343e61d054c4b25d6f67bd1086f3c to unrelated commit
2d6a3799fcda5c017f653c6e96b91964b07a7ee0
Authenticating channel 'guix', commits 9edb3f6 to 2d6a379 (365 new
commits)...

....

~/.cache/guix/checkouts/pjmkglp4t7znuugeurpurzikxq3tnlaywmisyr27shj7apsnalwq$
git reflog origin/master
2d6a3799fcd (HEAD -> master, origin/master, origin/HEAD)
refs/remotes/origin/master@{0}:
6eb19661c52 refs/remotes/origin/master@{1}:
0bce74d458a refs/remotes/origin/master@{2}:
1e336025957 refs/remotes/origin/master@{3}:
43e102be746 refs/remotes/origin/master@{4}:
bc8a41f4a8d refs/remotes/origin/master@{5}:
fba6896f625 refs/remotes/origin/master@{6}:
01de17143c4 refs/remotes/origin/master@{7}:
9756d9d6345 refs/remotes/origin/master@{8}:
e9b25a6c6c6 refs/remotes/origin/master@{9}:
79c597c0ee2 refs/remotes/origin/master@{10}:
5010a51fc91 refs/remotes/origin/master@{11}:
570ccaaedcb refs/remotes/origin/master@{12}:
64ed1f9eec9 refs/remotes/origin/master@{13}:
9f183c3627a refs/remotes/origin/master@{14}:
43a4215cad8 refs/remotes/origin/master@{15}:
cd557e2d1c8 refs/remotes/origin/master@{16}:
c1c9d6b3cdf refs/remotes/origin/master@{17}:
188d18fc47f refs/remotes/origin/master@{18}:
7af70efd763 refs/remotes/origin/master@{19}:
0485e3a4a6b refs/remotes/origin/master@{20}:
0ff72d105ca refs/remotes/origin/master@{21}:
3d2966e0b7d refs/remotes/origin/master@{22}:
69951a61a1d refs/remotes/origin/master@{23}:
93aefca7bab refs/remotes/origin/master@{24}:
d53ca793707 refs/remotes/origin/master@{25}:
0b5cbca689b refs/remotes/origin/master@{26}:
efdaa885b08 refs/remotes/origin/master@{27}:
f29f80c194d refs/remotes/origin/master@{28}:
75bad75367f refs/remotes/origin/master@{29}:
bf17a01e06a refs/remotes/origin/master@{30}:
386080366c6 refs/remotes/origin/master@{31}:
de24aaf13b1 refs/remotes/origin/master@{32}:
aefc7428203 refs/remotes/origin/master@{33}:
ec6d6a51a3a refs/remotes/origin/master@{34}:
3cf199dbcf8 refs/remotes/origin/master@{35}:
5ad54df6b09 refs/remotes/origin/master@{36}:
22143f9e62c refs/remotes/origin/master@{37}:
e02265a2f9c refs/remotes/origin/master@{38}:
570ef13a87b refs/remotes/origin/master@{39}:
a4464bd0975 refs/remotes/origin/master@{40}:

:~/.cache/guix/checkouts/pjmkglp4t7znuugeurpurzikxq3tnlaywmisyr27shj7apsnalwq$
git reflog master
2d6a3799fcd (HEAD -> master, origin/master, origin/HEAD) master@{0}:
reset: moving to 2d6a3799fcda5c017f653c6e96b91964b07a7ee0
6eb19661c52 master@{1}: reset: moving to
6eb19661c5202fdc2e6b27bb078ba4e528f3b984
0bce74d458a master@{2}: reset: moving to
0bce74d458a343e61d054c4b25d6f67bd1086f3c
1e336025957 master@{3}: reset: moving to
1e336025957583fd978df49a24c6a1bb358c618d
43e102be746 master@{4}: reset: moving to
43e102be746e5be11ddd9e1af9b65e3d8571d232
bc8a41f4a8d master@{5}: reset: moving to
bc8a41f4a8d9f1f0525d7bc97c67ed3c8aea3111
fba6896f625 master@{6}: reset: moving to
fba6896f625dcbeef112387fc90abe83acae1720
01de17143c4 master@{7}: reset: moving to
01de17143c4830926af6f00f5233d1ba32d7038d
9756d9d6345 master@{8}: reset: moving to
9756d9d6345fb142944261174453ab0a597cc2e7
e9b25a6c6c6 master@{9}: reset: moving to
e9b25a6c6c626a560d28a1f732e6e5d362d584a4
79c597c0ee2 master@{10}: reset: moving to
79c597c0ee27bc7ca7f5986ef71a90fb62e1422b
5010a51fc91 master@{11}: reset: moving to
5010a51fc91aeac5a3b87a3eea04f18f3fe8a3a3
570ccaaedcb master@{12}: reset: moving to
570ccaaedcb1e03d29c6cb420b2104627e57df63
64ed1f9eec9 master@{13}: reset: moving to
64ed1f9eec9596512b067af67799997f1e1e5c8e
9f183c3627a master@{14}: reset: moving to
9f183c3627a006e8fd3bb9708448bc05a6204e6d
43a4215cad8 master@{15}: reset: moving to
43a4215cad8c6da357f895569c0cedf5e854cee0
cd557e2d1c8 master@{16}: reset: moving to
cd557e2d1c83839dd587016279900d31f053efc8
c1c9d6b3cdf master@{17}: reset: moving to
c1c9d6b3cdf5955f1bf5fded2a0c496ce2e631f1
188d18fc47f master@{18}: reset: moving to
188d18fc47f0d38edfe06e3e5834fa8587bd300b
7af70efd763 master@{19}: reset: moving to
7af70efd7633b0d70091762cf43ce01a86176e8e
0485e3a4a6b master@{20}: reset: moving to
0485e3a4a6b33c5efe5367a04ba86f3563afd1e8
0ff72d105ca master@{21}: reset: moving to
0ff72d105ca03a82de6bb5193266fd05fce72daf
3d2966e0b7d master@{22}: reset: moving to
3d2966e0b7dbf15a5cb497037ace73d1be92febf
69951a61a1d master@{23}: reset: moving to
69951a61a1d8f1f2135ea2dc836738be282b97bc
93aefca7bab master@{24}: reset: moving to
93aefca7bab5f5b40164176e3224221d26d708f1
d53ca793707 master@{25}: reset: moving to
d53ca793707c2c94a580c572a5cf4ac383c951ee
0b5cbca689b master@{26}: reset: moving to
0b5cbca689b2f91949e191ca256ffc9bb48c1141
efdaa885b08 master@{27}: reset: moving to
efdaa885b083e85bd380ca914addfcf32d0834f7
f29f80c194d master@{28}: reset: moving to
f29f80c194d0c534a92354b2bc19022a9b70ecf8
75bad75367f master@{29}: reset: moving to
75bad75367fcf2c289fae3b40dbcc850f92177be
bf17a01e06a master@{30}: reset: moving to
bf17a01e06abc100651ed643f2d5c7fea07d37ba
386080366c6 master@{31}: reset: moving to
386080366c642d887f9156059e4e894cd2d4e9b1
de24aaf13b1 master@{32}: reset: moving to
de24aaf13b17d6c019f3f240fd0eb0e1b8654970
aefc7428203 master@{33}: reset: moving to
aefc7428203203ae88c64cc4769113453c01a185
ec6d6a51a3a master@{34}: reset: moving to
ec6d6a51a3ad4c3c0fe90cec1569e29a602d62e2
3cf199dbcf8 master@{35}: reset: moving to
3cf199dbcf85a44fa8370e786e568fc3feb7067c
5ad54df6b09 master@{36}: reset: moving to
5ad54df6b09b08b73453cf1071413693f053a0cc
22143f9e62c master@{37}: reset: moving to
22143f9e62c350e601e6eeb0151f5ffe62e9dfe6
e02265a2f9c master@{38}: reset: moving to
e02265a2f9c7e2e0201590bef5fad95f00798514
570ef13a87b master@{39}: reset: moving to
570ef13a87bb54d3410c431700ba78316a2641e2
a4464bd0975 master@{40}: reset: moving to
a4464bd0975c811f18af98f69032b29bddda5b81

I hope it helps

Regards
francis