Fix Depth 1 bug at very low time controls, some fishtesting workers, and delayed move senders like Arena.
Non-Regression STC:
LLR: 2.94 (-2.94,2.94) <-1.75,0.25>
Total: 98208 W: 25423 L: 25276 D: 47509
Ptnml(0-2): 271, 10713, 26994, 10850, 276
https://tests.stockfishchess.org/tests/view/69ad43c21d849c824c6afe82
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Hell VVSTC (0.2+0.02)
LLR: 2.70 (-2.94,2.94) <0.00,2.00>
Total: 688 W: 660 L: 11 D: 17
Ptnml(0-2): 1, 0, 10, 15, 318
https://tests.stockfishchess.org/tests/view/69ae4bea1d849c824c6b00b0
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Sudden Death (1+0)
LLR: 2.19 (-2.94,2.94) <-1.75,0.25>
Total: 538 W: 536 L: 0 D: 2
Ptnml(0-2): 0, 0, 0, 2, 267
https://tests.stockfishchess.org/tests/live_elo/69ae6c031d849c824c6b00dc
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Sudden Death (5+0)
LLR: 2.94 (-2.94,2.94) <-1.75,0.25>
Total: 22248 W: 6058 L: 5802 D: 10388
Ptnml(0-2): 214, 2420, 5583, 2710, 197
https://tests.stockfishchess.org/tests/view/69ae6dd01d849c824c6b00ee
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Fixes #6639
closes https://github.com/official-stockfish/Stockfish/pull/6659
No functional change