Quick answer: Construct 3 tilemap showing seam glitches at zoom levels like 1.3x? Sub-pixel sampling on tile edges - use point filter and integer zoom or padded tilemaps.
Pinch-zoom on mobile to 1.3x; tile borders show 1-pixel gaps.
Use point filter
Tile texture > filter = point. Crisp sampling; no sub-pixel blend.
Or pad tiles
Tile atlas with 1-pixel margins; sampling stays in tile bounds.
Quantize zoom
Snap zoom to integer or half-integer. No sub-pixel zoom; no glitches.
“Sub-pixel tilemap sampling introduces seams. Avoid sub-pixel or pad.”
If your tilemaps zoom, the padding pass is one-time work. Save the seam debugging later.