HD Custom Icons Flickering in Monterey

Am running google drive & dropbox & calendar might be using icloud although tried to set up syncing wirelessly with ipad. Is only affecting separate time machine HD & one other backup disk although two other disks on desktop have custom icons as well (startup & a scratch drive) which are unaffected. Doubt if google drive accesses the backup or TM drives directly but it might i guess. Thanks for the links tho as it clearly is a thing. Will start with boot in safe mode to see if additional maintenance scripts have any effect. Just happened again but only to the backup & not TM drive that time ..

Sorry these postings are a bit random - just noticed backup drive icon flicker exactly on the hour when i know a CCC task is scheduled so the drive is being written to .. system log in console shows :

'AMPDevicesAgent[650]: Entered:_AMMuxedDeviceDisconnected, mux-device:48'

nothing much showing from CCC in logs ..

The flickering sometimes seems to coincide with a notification message top right from calendar ..

Problem of flickering icons still here. Re: "have you got Google Drive installed?" - don't have Google Drive client locally installed, access it only from Google apps in browser. One drive is being backed-up on the hour by CCC & icon flickers when being written-to. Other drive is for Time Machine, flickering is twice per hour mebbe ..

(Am not going through resetting NVRAM etc, would make no difference ..)

For info - only app that should write to the backup drive is Carbon Copy Cloner & presumeably it's only the system that writes to the dedicated TM drive ..