Running an actionbar title immediately hides title title

Partner Rank: 2

Partner Team Reporting: Shapescape

Verification Builds: 1.18.30.26 (and any 1.18.30.XX build tested)

Summary: Running a title to display text on the actionbar immediately hides a main title and subtitle that is currently displaying.

Impact: This breaks a system that relies on displaying text in both of those slots at the same time. It impacts content currently in production as well as live content, as reported by other partners.

Repro steps:

1. Run this command in chat to have the title stay there for 100s /title @a times 0 2000 0
2. Run this command to display a title /title @a title test
3. Run this command to display text on actionbar /title @a actionbar testing
4. Notice the title saying "test" disappearing

Repro Rate: 10/10

Observed Results: The actionbar title appears and the main title text (and any subtitle) disappear.

Expected Results: The actionbar appearing should not be causing other title slots to be cleared.

Screenshots / Videos attached: Yes

Regression Builds: 1.18.20.29

Notes: It's worth noting that if the actionbar title is run first, and then the regular title is run, both texts can appear on the screen at the same time. This however would not let us utilize fade times for main title text, if actionbar text is to stay on screen. The current situation would also require us to work around the introduced limitation.

The changelog for the first 1.18.3 beta (1.18.30.20) did mention a change to titles (https://feedback.minecraft.net/hc/en-us/articles/4577469770381) :
"Title commands fired before a client was done joining will now show instead of being ignored"