Fix MemorySanitizer: use-of-uninitialized-value with MODE_UPDATE

[dahbka-lis]

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Description for reviewers

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[github-actions]

🟢 2025-04-30 13:20:48 UTC The validation of the Pull Request description is successful.

[github-actions]

⚪ 2025-04-30 13:25:47 UTC Pre-commit check linux-x86_64-release-asan for a9bae24 has started.
⚪ 2025-04-30 13:25:57 UTC Artifacts will be uploaded here
⚪ 2025-04-30 13:28:49 UTC ya make is running...
🟡 2025-04-30 14:49:27 UTC Some tests failed, follow the links below. This fail is not in blocking policy yet Going to retry failed tests...

Details

Test history | Ya make output | Test bloat

TESTS	PASSED	ERRORS	FAILED	SKIPPED	MUTED?
12735	12607	0	71	36	21

⚪ 2025-04-30 14:50:35 UTC ya make is running... (failed tests rerun, try 2)
🟡 2025-04-30 15:17:43 UTC Some tests failed, follow the links below. This fail is not in blocking policy yet Going to retry failed tests...

Details

Test history | Ya make output | Test bloat | Test bloat

TESTS	PASSED	ERRORS	FAILED	SKIPPED	MUTED?
752 (only retried tests)	656	0	50	25	21

⚪ 2025-04-30 15:17:55 UTC ya make is running... (failed tests rerun, try 3)
🟡 2025-04-30 15:44:41 UTC Some tests failed, follow the links below. This fail is not in blocking policy yet

Test history | Ya make output | Test bloat | Test bloat | Test bloat

TESTS	PASSED	ERRORS	FAILED	SKIPPED	MUTED?
712 (only retried tests)	607	0	48	37	20

🟢 2025-04-30 15:44:50 UTC Build successful.
🟢 2025-04-30 15:45:21 UTC ydbd size 3.8 GiB changed* by +11.0 KiB, which is < 100.0 KiB vs main: OK

ydbd size dash	main: 9c0e538	merge: a9bae24	diff	diff %
ydbd size	4 122 199 576 Bytes	4 122 210 888 Bytes	+11.0 KiB	+0.000%
ydbd stripped size	1 428 899 736 Bytes	1 428 905 880 Bytes	+6.0 KiB	+0.000%

^{*please be aware that the difference is based on comparing your commit and the last completed build from the post-commit, check comparation}

[github-actions]

⚪ 2025-04-30 16:24:40 UTC Pre-commit check linux-x86_64-relwithdebinfo for a9bae24 has started.
⚪ 2025-04-30 16:24:59 UTC Artifacts will be uploaded here
⚪ 2025-04-30 16:28:09 UTC ya make is running...
🟡 2025-04-30 17:30:01 UTC Some tests failed, follow the links below. Going to retry failed tests...

Details

Test history | Ya make output | Test bloat

TESTS	PASSED	ERRORS	FAILED	SKIPPED	MUTED?
20283	18916	0	6	1326	35

⚪ 2025-04-30 18:02:04 UTC ya make is running... (failed tests rerun, try 2)
🟢 2025-04-30 18:25:34 UTC Tests successful.

Test history | Ya make output | Test bloat | Test bloat

TESTS	PASSED	ERRORS	FAILED	SKIPPED	MUTED?
142 (only retried tests)	113	0	0	0	29

🟢 2025-04-30 18:25:40 UTC Build successful.
🟢 2025-04-30 18:25:55 UTC ydbd size 2.2 GiB changed* by +400 Bytes, which is < 100.0 KiB vs main: OK

ydbd size dash	main: 7e2dece	merge: a9bae24	diff	diff %
ydbd size	2 343 243 016 Bytes	2 343 243 416 Bytes	+400 Bytes	+0.000%
ydbd stripped size	492 710 528 Bytes	492 710 656 Bytes	+128 Bytes	+0.000%

^{*please be aware that the difference is based on comparing your commit and the last completed build from the post-commit, check comparation}