MacVim's find dialog window is adding a 2nd slash to all regex commands

[Peter R]

I'm using macOS 10.15.7 and MacVim r179 (Vim 9.1.0).

When running any find command using regex from the MacVim's dialog box, e.g.

andy\|bek

with ignore case option,

the Vim window displays the error message:

E486: Pattern not found: \V\candy\\|bek

But from the Vim itself, this works fine:

/\V\candy\|bek/

Using \.\* or \* creates a second slash, too.

I wasn't able to find any solutions on Google either. Thank you for your assistance!