Startup Applications: switch off Nvdia, come back, no more Nvdia and 2X "Unavailable" (/bin/false)

[SebastJava]

 * version 4.8.3+ulyssa
 * Linux Mint 20.1 Cinnamon
 * Device-1: Intel 2nd Generation Core Processor Family Integrated Graphics vendor: Dell driver: i915
 * 64 bit

Issue
In Menu > Preferences > Startup Applications, i switched off Nvdia, came back 5 min. later, and there is no more Nvdia and there are two copies of "Unavailable" (/bin/false).

Steps to reproduce

1. Open Preferences > Startup Applications.
2. Switch Off Nvdia.
3. Close Startup Applications window.
4. Come back 5 minutes later and open Startup Applications window again.

Now Nvdia is gone, and got replaced by two identical "Unavailable" (/bin/false)

Expected behaviour
I would expect to have the choice to re-open Startup Applications window and change my mind about switching on or off some application. But instead, Nvdia is gone and now i fear "Unavailable" (/bin/false) could get launched two times.

[SebastJava]

Two times the same thing and Nvdia is gone...

[SebastJava]

Ah, now i open Startup Applications 2 days later, and "Unavailable" (/bin/false) is displayed correctly: just one.
But Nvdia is still gone. I don’t care. I don’t need it.