[agerveshi-unity]

The FlatBuffers spec requires a struct's size to be a multiple of its alignment, so consecutive struct vector elements stay aligned. flatc does this via PadLastField; FlatSharp pads between fields but never rounds up the total. A struct whose last field is narrower than its alignment serializes short. This is fine at the end of a table where the vtable absorbs it, but in an array of structs every element after the first lands at the wrong offset.

The fix is one line after the field loop in ValueStructTypeModel and StructTypeModel. inlineSize feeds PhysicalLayout, the serialize/parse slices, MaxInlineSize and the emitted [StructLayout] size, so it propagates from there.

Tests

12 struct instances across 5 schemas change size, updated the matching test expectations and schema doc comments. The two PoorlyAligned tests asserted a size (5) is not a multiple of the alignment (4) error; at 8 bytes that no longer throws, so both became round-trips.

All tests passed locally (excluding tests without a Mac arm64 target).

csproj

Modified for Unity compatibility, do not upstream.

[joejo-unity]

The fuzzing job may need to have a longer timeout? Otherwise, LGTM.