Lines are moved down when lines underneath it are removed

[DoomTay]

For example

; Script generated by Aegisub 3.2.2
; http://www.aegisub.org/
Title: Test Overlap Thing
ScriptType: v4.00+
WrapStyle: 0
ScaledBorderAndShadow: yes
YCbCr Matrix: None
PlayResX: 640
PlayResY: 360

[V4+ Styles]
Format: Name, Fontname, Fontsize, PrimaryColour, SecondaryColour, OutlineColour, BackColour, Bold, Italic, Underline, StrikeOut, ScaleX, ScaleY, Spacing, Angle, BorderStyle, Outline, Shadow, Alignment, MarginL, MarginR, MarginV, Encoding
Style: Default,Arial,20,&H00FFFFFF,&H000000FF,&H00000000,&H00000000,0,0,0,0,100,100,0,0,1,2,2,2,10,10,10,1

[Events]
Format: Layer, Start, End, Style, Name, MarginL, MarginR, MarginV, Effect, Text
Dialogue: 0,0:00:00.00,0:00:05.00,Default,Bob,0,0,0,,I'm early
Dialogue: 0,0:00:02.50,0:00:07.00,Default,Joe,0,0,0,,And I'm kinda late

As soon as the first line of dialogue disappears, the second line of dialogue will move down to take its place

On, say, Aegisub on the other hand, the second line will stay in place.

[Arnavion]

Huh. I was sure this was documented in the README as a known issue, but guess not.