Boss bar text turns white after relogging

The bug

When creating a boss bar and setting its color the color of the text changes too as seen in Picture 1.PNG. But when you relog the text turns white as seen in Picture 2.PNG.

How to reproduce

1. Use the following commands to set up the bossbar properly:

   /bossbar add test "Test"
   /bossbar set test value 100
   /bossbar set test color red
   /bossbar set test players @s
   

   → The text above the bossbar will appear red now

2. Exit and reenter the world
   → The text will now be white