Extra's Custom Bonus Speed Unresponsive to Downgrading Speed

[Aki1024]

Describe the bug
When typing in a custom speed, such as 999, the game's speed updates to the new number on each button press. When deleting numbers to reduce the speed, the game's speed does not update with some option settings.

To Reproduce
Have Bonus Seconds clicked such that Bonus is On, with available bonus time to speed up the game.
Deselect options 10x and 20x bonus speed.
In Extras->Custom Bonus Speed-> Type in a large number, such as 999
Witness game increase in speed
Delete numbers, reducing target speed by magnitudes
Witness game continue to be high speed

Work around
Enter a Background Bonus Speed different than Custom Speed
Click away from game, then return to game
Witness target lower speed respected

OR

Have either 10x, 20x or both checked.

Expected behavior
As the custom speed's number changes, the game's speed updates to match.

Savefile
https://pastebin.com/Juhjg9Pr

Additional context
Version 3P.1.1 +1 (latest version number isn't actually written, nor a date. Not sure how to reference the version of game I am on.)
As I wanted a speed that wasn't 10x or 20x, I deselected those two options. Seems this pushes me into a bug.

[Aki1024]

Looks like Pastebin staff deleted the save file. :/