fix(s3stream): find in data block with real record size

[SCNieh]

No description provided.

[codecov]

Codecov Report

Merging #839 (fd3f978) into main (1b2e195) will increase coverage by 0.02%.
The diff coverage is n/a.

Additional details and impacted files

@@             Coverage Diff              @@
##               main     #839      +/-   ##
============================================
+ Coverage     55.47%   55.49%   +0.02%     
- Complexity     1242     1245       +3     
============================================
  Files           132      132              
  Lines          8530     8530              
  Branches        787      787              
============================================
+ Hits           4732     4734       +2     
  Misses         3380     3380              
+ Partials        418      416       -2     

Components	Coverage Δ
RocketMQ Broker	∅ <ø> (∅)
RocketMQ Common	5.80% <ø> (ø)
RocketMQ Controller	54.58% <ø> (ø)
RocketMQ Proxy	37.81% <ø> (+0.10%)	⬆️
RocketMQ Store	74.27% <ø> (ø)
RocketMQ Stream	∅ <ø> (∅)
RocketMQ Metadata	35.44% <ø> (ø)

see 1 file with indirect coverage changes