Flagged emails always change their colors to red
On my iPhone Xs and iPad Pro 10.5 I use my @icloud.com mailbox. At the beginning everything was fine; however, now all the flagged emails are red. The weird thing is that there surely is an information about the flag color on icloud, because when I flag an email on my iOS or iPadOS device with different color, e.g. green, it will appear correctly (green) on my Macbook. Has anyone noticed such an issue? Do you know how to fix it?
Note: it is not related to a specific version of iOS or iPadOS.
iPhone XS