Unfortunately, upstream breaks users scripts by intention without
warnings in the previos stable release 1.10.1 about deprecating ‘bin’
directory for ‘vncserver’ in next release, and mention this in release
news [1]:

  vncserver has gotten a major redesign to be compatible with modern
  distributions

[1] https://github.com/TigerVNC/tigervnc/releases/tag/v1.11.0

Apologies for missing that.  I reverted the package downgrade to 1.10.1.

Oleg.