Volume control changes all sync'd players regardless of volume sync setting

[WJCFerguson]

When I select a player on Squeezer and change its volume, all players in the group change, even the one that's configured via the server to be locked at 100%. I believe I've configured everything otherwise but Squeezer will only adjust volume to the whole group.

I have:

• selected "Don't sync player's volume" on Squeezer (as an aside, players plural, so that apostrophe should be after the "s")
• Each individual player is configured on the server settings with "Don't sync player's volume" (apostrophe correct for one player)
• One player is even configured on server as "Output level is fixed at 100%".

It seems like the Squeezer "Don't sync" option only controls whether they are all identical levels. Whether that's selected or not, volume control adjusts all players, even the fixed-output one.

I'm not sure how long it's been doing this but I would swear not always. I have been finding my other players on undesired volume settings for a while and only just worked out that Squeezer is doing it, and somehow breaking through the fixed output setting.

Issue #754 is relevant, but the functionality described there isn't what I see. Issue #653 says sync control functionality came in 2.2.2, but I think it's broken

Thank you for Squeezer - otherwise it works very nicely and without fuss.