Profile icon default texture is still the old blocks texture.
1.14 texture update does not apply to the launcher.
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Also it seems to affect the application icon.
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Linked issues
is duplicated by 2
relates to 7
MC-137565
Cod and cooked cod item uses old texture
Resolved
MC-138633
The title screen needs updating in 1.14 snapshots
Resolved
MC-129542
The title screen panorama hasn't been updated with features in Update Aquatic
Resolved
MC-138043
Poppy textures has spines
Resolved
MC-138425
Stained glass and stained glass pane still uses the old glass texture lines
Resolved
2 more links
1.14 is only released in snapshots, so i think the new textures will not be applied to the launcher before 1.14 is released.