m=d selector claims to be invalid

Partner Rank: 3

Partner Team Reporting: Jigarbov Productions

Verification builds: 1.16.0 - 1.16.220

Summary:
m=d selector claims to be invalid

Impact:

reduces functionality of m= selector and will cause me to use work arounds which is a minor inconvenience.

Repro Steps:

1. create a new world
2. enable cheats
3. type execute @a[m=d] ~ ~ ~ say hi

Observed Results:

game will claim m=d is an invalid selector even though d comes up as an autocomplete solution and is a valid gamemode

Expected Results:

d selector on m= should correctly select players in the default game mode.

Regression Builds: - checked as far back as 1.16.0 and it was like that too, so who knows how long its been broken

Notes: