Lodestone compass uses the normal instead of a blue compass texture like in Bedrock Edition

Why would it be blue?

In Bedrock Edition, they are show bule glint.

I doubt that this is intended. This is tracked as a Bedrock Edition issue at MCPE-73393.

Actually, it's not the glint; bedrock uses a blue-ish compass texture instead of the normal one.

Why was this resolved?

@unknown I believe in this case it means they have assessed it and believe its the Bedrock version of this report that is considered the "bug". Therefore the Java side is closed as WAI and the Bedrock behavior will be tracked using the Bedrock report (MCPE-73393).

If the reported behavior is deemed to be correct in the edition it was reported for, the report will be closed, and a new corresponding report will be opened on the other project (unless it already exists).

Source: https://www.reddit.com/r/Mojira/comments/g9rjfh/from_now_on_well_accept_bug_reports_about_certain/

Correct.
Also note that MCPE-73393 got an ADO, which means it is tracked in their internal tracker.

That's a massive shame, would have wanted support for alternative glows in java.

As FVbico already said, it's actually not an alternative glow, but a different compass texture in Bedrock.