In Pathfinder 2e, if a 20th level caster fails to learn a spell, can they never try again?

On page 238 of the Core Rulebook, under "Learn a Spell", the rules state:

Failure You fail to learn the spell but can try again after you gain a level. The materials aren’t expended.

Since character level is capped at 20th, does this mean that a 20th level caster who fails to Learn a Spell can never try to learn that spell again?