Fire damage progress ignored upon resuming

[Vhati]

Seen in 1.5.13.

After my hacking system finished disrupting and ionized itself (turning the power bar blue), a red giant spawned fires in the hacking system's room. When the fires turned the bar partially red, I saved. Damage progress in "continue.sav" was 34%.

On resuming, the red portion of the bar was all blue again.
I let it burn a little and saved. The damage progress in "continue.sav" was 6%.

Back in-game, by the time ionization wore off, progress was at 59%. Saved.
On resuming, progress was reset. Let it burn, saved. File said 6%.

So progress is saved correctly, but then it gets ignored.