Tried it , here is the probable answer

Across

1. (5A) DESK

2. (7A) BEHIND

3. (10A) AMATEUR

4. (13A) EXCESS

5. (14A) PATH

6. (16A) STAND

7. (18A) MECHANIC

8. (19A) WIFE

9. (20A) POPULAR

10. (21A) RACE

11. (22A) ADMIT

12. (24A) HUMAN

Down

1. (1D) GOOSE

2. (2D) ADDRESS

3. (3D) GIANT

4. (4D) AGENT

5. (6D) START

6. (8D) ERROR

7. (9D) OLD

8. (11D) MEADOW

9. (12D) MUSIC

10. (15D) LAZY

11. (17D) IMPACT

12. (23D) BRAINLESS (or “SPEECHLESS”)

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Discussion

If you have the answer you can access the bitcoin yourself. The wallet still has bitcoin in it, https://mempool.space/address/bc1q7petzurp9ezxmejggx28hc35s2ajsyf0slhflk

Why “Not Working” as a Seed?

A valid BIP‑39 seed must use only words from the official list. This puzzle’s required letter‐lengths force words (like “mechanic,” “goose,” “error,” “amateur,” etc.) that aren’t in BIP‑39.

Conclusion:

The crossword puzzle cannot be perfectly solved with a 100% valid BIP‑39 seed.

The grid can be solved as shown (the “official” puzzle solution), but it won’t import into a wallet.

Or you can pick only BIP‑39 synonyms, but then they won’t match the letter layout given

You must choose one goal: a perfect crossword (which breaks BIP‑39) or a perfect BIP‑39 seed (which breaks the crossword layout). There’s no single solution that does both.

I am sure there are multiple solutions for the grid. You are right, the words need to be a valid BIP-39 phrase. There is definitely a solution that satisfies the definitions, the grid and the BIP-39 word list.