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https://discussions.apple.com/thread/250874875?answerId=251677735022#251677735022
linked to the post by tathos and answered by the community.
I would like to add that this could also be hardware related. I noted (tried several times) that when i turn my mbp off (2019 entry level) with the AC source plugged in, rainbow flickers are present, but when i turn it off unplugged, it shuts down normally.
Reset SMC: How to reset the SMC of your Mac - Apple Support Choose the appropriate method.
If this doesn’t help, contact Apple Support: https://support.apple.com/contact
Reset SMC: How to reset the SMC of your Mac - Apple Support Choose the appropriate method.
If this doesn’t help, contact Apple Support: https://support.apple.com/contact
Flickering Rainbow Screen glitch when shutting down
