Reply Does Not Always Work

K-9 Mail 5.806 on Chromebook/ChromeOS 93.0.4577.85 (Official Build) (64-bit). POP3 single account.

Ever since the last update of K-9 Mail, the Reply function does not always work. I receive a piece of mail, and if I try to reply, the Reply arrow is sometimes “dead.” Clicking on it accomplishes nothing. At other times it works correctly. The problem is unpredictable and is a serious problem.