Stuck in a folded section when subtree is folded

[PT <spamfilteraccount@gmail.com>]

If a header has some text content under it and the cursor is in
the text then pressing TAB folds the content, but it doesn't
change the cursor position, so the cursor is stuck in the folded
part and, for example, beginning-of-line doesn't work, you can
only get out from the folded part if you press cursor up/down

Isn't it a bug?

If I stand on a header which has only subheaders under it and I
press TAB then the subtree is folded and the cursor is put back
to the beginning of the header line apparently to avoid leaving
the cursor in the folded part which is a nice gesture.

Shouldn't the same happen when textual content is folded?