This is probably a bug and the mojang will need to fix the  launcher, but I suggest making a backup of your saves folder, deleting .minecraft and the launcher, and reinstalling.

If you continue to have problems with the regular launcher, feel free to use MultiMC (multimc.org)

Minecraft Launcher NOT launching any Previous Versions!

Hardrocker

LordGeek101

Minecraft: Java Edition

dumbo0116

qRain_

ToraneRuri

BurgerZi

Eclipsed_Lunar

1.2.1

1.2.2

1.2.3

1.2.4

1.2.5

1.3.1

1.3.2

1.4.2

1.4.4

1.4.5

1.4.6

1.4.7

1.5.1

1.5.2

1.6.1

1.6.2

1.6.4

1.7.2

1.7.4

1.7.5

1.7.9

1.7.10

1.8.1 Easy

Normal

Hard

Hardcore

1.8.2

1.8.3

1.8.4

1.8.5

1.8.6

1.8.7

1.8.8 4 Players

5-9 Players

10+ Players

1.8.9

1.7.6

1.7.7

1.7.8

1.9.1

1.9.2

1.9.3

1.9.4

1.10

1.11.2

1.11

1.12

1.12.1

1.12.2 2 Players

3 Players

1.7.3 Set Seed

Random Seed

1.1-1.6

1.8-1.11

No F3

1.13

1.13.1

1.13.2

1.10.2

1.14

1.14.2

1.14.3

1.14.4

1.15

1.15.1

1.15.2 Pre 1.8

1.13-1.15

Pre 1.9

1.14+

1.9-1.15

Vanilla

Version

Difficulty

Player Count (Any% Glitchless Co-op)

Seed Type (Any% Glitchless)

Version Range (AAch)

Seed Type (Any%)

Seed Type (Any% (Peaceful))

Seed Type (Any% Glitchless (Peaceful))

Seed Type (AAch)

Version Range (AAdv)

Seed Type (AAdv)

Version Range (Any% Glitchless)

Version Range (Any%)

Version Range (Any% Glitchless Co-op)

Mods

Version Range (Any% Glitchless (Peaceful))

Version Range (Any% (Peaceful))

Version Range (Any% Glitchless (Demo))

Player Count (AAdv Co-op)

Seed Type (AAdv Co-op)

Version Range (AAdv Co-op)

Seed Type (Combined Any% Glitchless)

Seed Type (Any% (Time Travel))

Seed Type (Any% Glitchless Co-op)

Splits (Combined Any% Glitchless)

If you save & quit/close the game at any point during the run, choose External.

Internal/External (Any%)

### Updated Legal Mods
- (**1.3.1-1.21.7**) State Output 1.2.3: Fix inworld state being set before Downloading Terrain screen goes away in pre 1.13.
- (**1.8-1.8.9**) Anchiale 3.2.0: Remove "Replace Save & Quit" button placement option.
- (**1.8, 1.8.9, 1.20.5-1.21.7**) Atum 4.2.1, 5.2.1, & 1.3.3: T

Updated legal mods + accidental resets

Rules v5

Update on version tracking for legal mods

Minecraft

Minecraft Speedrunning Questions Thread

Form for requesting custom map / server leaderboards

how to do mapless bt?

Having trouble finding nether fortress

Leaving and rejoining world

What is "Julti" and "Jingle?

Awesomecuber

AprilSR

skylewl

draconix

Luminosity

ElRichi

DrGuy

Keima

Specnr

AlEmeralds

Armpitsmoothie

audioSalix

silverr

gaylea

BSRF

luvvlyjude

taffel

Hayley

3sonya

tildejustin

Ev212

the_yuukster

r0hkx

leto_saa

t1daIw4ve

TristanFour

JeevesGake

Brawl876