Using dBpoweramp Music Converter R17 on Mac, when a tag contains a colon a file name comes out as expected when Converting a file, but when using "Arrange Audio" dMC doesn't follow it's own Restricted Character rules and puts a forward slash in place of a colon.

Here are the resulting filenames, using the same dynamic naming and same restricted character rules for both "Convert to MP3" & "Arrange Audio"
CleanShot 2020-05-23 at 14.51.34@2x.png

Here are the rules (just using the defaults) found under dMC > Advanced Settings > Converter > Set Filename Restricted Characters:
CleanShot 2020-05-23 at 14.56.39@2x.jpg