Hi,
only for information.
Ive made a sd card with the new Raspberry pi OS Bullseye (on a pi 3b) and installed dvswitch manually into the new standard raspian os bullseye (fully version) with all components including analog reflector.
 explained in Appendix E on the DVSwitch manual.
1.) no changes from procedure in manual
2.) all worked fine

Remarks: use a 16Gb SD Card if you use fully OS, ive made a new installation not an update from buster to bullseye !!!!