These in particular are printed because a localscript changes visibility of certain GUI elements.
It also copies those elements but i think these prints come from changing the original ones.
Normally with FE client doesn’t send changes to the server that the server would reject anyway. Sounds like you found a case when client side filtering does not happen - if you create a small repro case we will take a look.
There is a setting for if these filtering messages should be printed but it seems that they are being printed even with this setting turned off. The setting is normally in Settings>Network>Diagnostics>PrintFilters.
I found where this message is printed and I think I can just add a check for the setting there.
I have submitted a fix to stop these updates being sent to the server when they will be rejected. It should be released this week and turned on shortly after that.