ESC pausing in a Miraged Blight makes Blight fastforward button disappear

Steps to repro:

1) find a Blight in a Mirage (it's not hard, Mirage seems to spawn beside Cassia 100% of the time, which may be another bug)
2) start Blight
3) press ESC a few times until you see the fastforward button disappear. 3-4 seconds at most