This was a change done a couple months ago maybe a year now, where from a distance the metins do not glow anymore for improved performance (as far as i am aware). However, in some cases like beta maps, it causes the metins to blend in with the terrain. I'd suggest to:
Either
1. add a toggle for that feature, where you can enable/disable if you have performance issues
or
2. revert the change
or
3. disable it on specific metins only
Either
1. add a toggle for that feature, where you can enable/disable if you have performance issues
or
2. revert the change
or
3. disable it on specific metins only