Can't complete study letters toddler milestone

Product: The Sims 4
Platform:PC
Which language are you playing the game in? English
How often does the bug occur? Every time (100%)
What is your current game version number? 1.97.42.1030
What expansions, game packs, and stuff packs do you have installed? Almost all, including growing together
Steps: How can we find the bug ourselves? Have level 5 thinking skill and complete the study numbers milestone.
What happens when the bug occurs? Can't complete the study letters milestone.
What do you expect to see? To complete
Have you installed any customization with the game, e.g. Custom Content or Mods? Yes
Did this issue appear after a specific patch or change you made to your system? Yes
Please describe the patch or change you made. Latest update that fixed "[FIXED] [GRO] Study Numbers toddler milestone can't be completed"

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Hi,

My toddler sim aged up from an infant with level 2 toddler skills.

The toddler sim reached the study numbers milestone and is now level 5 thinking skill.

At level 5, the nesting blocks option "spell words" and the flash card option "teach letters" is available.

However, both actions do not give the milestone.

Is this milestone to be unlocked at another level?

Or is this a bug again?