I'm trying a model which did work with QGIS 3.12 but don't in QGIS 3.16. In this model, two vector layers are merged by the algorithm
native:mergevectorlayers. In the new version if a field of similar type but with a smaller size is given as first element, an error message appears:
Feature could not be written to Merged_062872d0_f531_40e7_8e55_cd911e6e91f4: Could not store attribute "NATURE": String of length 25 exceeds maximum field length (20)
I can't control which element is given in first during the merge processing. I just know that two vector layers have same fields. I can't select specific fields as is done in this answer Merge Vector Layers fails in QGIS. Has anyone had the same issue?