Current git version stacking issue

Siril version: latest git master (4/6/22)

Note: please report against latest git master branch or latest stable version

Operating System: Kubuntu 22/04

Package: compiled from git

Description of the bug

Stacking produces linear patterns across the image, with parts of the image stitched together in the wrong order. The same sets of images stack perfectly with v1.0.2 stable.

Reproduction

Reproduction steps:

Build sequence of images. Bug is apparent with 16 bit undebayered flats and also with 32-bit debayered and preprocessed lights. Stack sequence. Bug is apparent with both multiplicative and additive with scaling stacking methods.

Expected result: Correctly stacked image.

Actual result: See attachments.

Additional information

Please provide any backtrace or warnings/error you could have, paste it here.

Siril console output from stacking the NGC5449 image.

12:49:09: Stacking will use registration data of layer 1 if some exist.
12:49:09: Stacking: processing...
12:49:09: Processing all images in the sequence (16)
12:49:09: Stacking result will be stored as a 32-bit image
12:49:09: Computing normalization...
12:49:09: With the current memory and thread (16) limits, up to 16 thread(s) can be used for sequence normalization
12:49:09: Normalization computation time: 2.03 ms.
12:49:09: Using 11144 MB memory maximum for stacking
12:49:09: We have 30 parallel blocks of size 345 (+6) for stacking.
12:49:09: Starting stacking...
12:49:09: Error reading one of the image areas
12:49:10: Error reading one of the image areas
12:49:10: Pixel rejection in channel #0: 0.000% - 0.000%
12:49:10: Pixel rejection in channel #1: 0.000% - 0.000%
12:49:10: Pixel rejection in channel #2: 0.000% - 0.000%
12:49:10: Rejection stacking complete. 16 images have been stacked.
12:49:10: Integration of 16 images:
12:49:10: Pixel combination ......... average
12:49:10: Normalization ............. additive + scaling
12:49:10: Pixel rejection ........... Winsorized Sigma Clipping
12:49:10: Rejection parameters ...... low=3.000 high=3.000
12:49:11: Background noise value (channel: #0): 33.999 (5.188e-04)
12:49:11: Background noise value (channel: #1): 32.845 (5.012e-04)
12:49:11: Background noise value (channel: #2): 34.446 (5.256e-04)
12:49:11: Saving FITS: file r_pp_ngc5449_stacked.fit, 3 layer(s), 5184x3456 pixels, 32 bits
12:49:11: Execution time: 2.19 s.