/return run function in combination with a fork and a function that doesn't return has inconsistent behavior

The /return run when applied to a fork and a /function that doesn't return causes different behavior depending whether it is run in chat, inside of a function or using /debug function.

How to reproduce:
The attached data pack contains a function called bugtest:test with the following command:

execute as @e[tag=selected] run return run function bugtest:test2

The function bugtest:test2 is a small function that just contains the command "say Test" and doesn't return.

Now spawn multiple entities with the tag "selected", e.g. using the following command:

summon armor_stand ~ ~ ~ {Tags:["selected"]}

Then run the following commands:

1. The command above directly in chat (the one with /return run)

2. /function bugtest:test

3. /debug function bugtest:test

Observed behavior:
1. and 3. The message "Test" appears for every entity spawned.
2. The message "Test" appears once and the function returns.

Expected behavior:
In all of the cases the message should only be shown once and return since /return run is supposed to always return.