"macOS Big Sur 11.5.2 includes bug fixes for your Mac."

A M1 Mini owner running Big Sur 11.5.1 said software update listed the 11.5.2 update as 2.54GB, but the actual 11.5.2 update download was 3.45GB. As with previous updates, installed using Safe Mode. (No change to M1 Mini firmware version - still 6723.140.2.)

Check Apple's Big Sur forum for feedback. (Posts may be in previous problem threads.)
Some previous posts about delays when using the Caps Lock key said 11.5.2 solved it.
Also saw some say the startup chime returned in 11.5.2. (Some had said previous updates muted it, even when enabled in preferences. That was never an issue with a friend's M1 mini.)

And for M1 owners, also check the Mac Mini, iMac, MacBook Pro, & MacBook Air forums.

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