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The internal slicer picked PETG for a PLA plate and an A1 process for a P1S. Both come from the sidecar's bundled-profile listing, fixed in the sidecar repo; this is the consuming half plus the hardening that keeps an older sidecar degrading rather than breaking. Standard-tier presets now carry the compatible_printers the sidecar reports. That list is the only truthful account of which printer a preset belongs to, because the bundle ships no process preset named after a P1S, an X1, an X1E or an H2D Pro -- all ten of the P1S's are named "@BBL X1C" and name the P1S only in that list. Reading the printer out of the preset NAME therefore made a P1S look like it had no compatible process at all: all 198 hid behind "Show all" and the auto-pick fell through to an alphabetically-first 0.06mm Fine @BBL A1 0.2 nozzle the CLI refused. A P1S now gets 0.20mm Standard @BBL X1C and 73 filaments instead of 4. An older sidecar reports nothing here, which leaves the name matcher in place -- degraded as before, not broken. Material is now a hard partition in the filament pre-pick rather than a +10 bonus. A preset stating a different material than the plate asks for is the wrong preset, not a worse one: wrong nozzle temperature, wrong bed temperature, wrong flow. A preset stating NO material stays eligible -- unknown is not wrong, and 32 shipped profiles genuinely have none. The same rule reaches the retain path, which held a slot on printer-compatibility alone and so cemented a wrong-material pick through every re-pick. A preset the user chose themselves is exempt: printing PETG on a plate a designer labelled PLA is a legitimate thing to do, and this rule exists to correct the auto-pick, not to overrule the user. Two more, both found while tracing this and neither reported: Among process presets equally valid for the selected printer, the one nearest a 0.2mm layer height now wins. Within a tier the list is alphabetical and Bambu's naming puts the finest height first, so every slice that did not name its own process silently got 0.08mm Extra Fine on an X1 Carbon and 0.06mm Fine on an A1 mini -- correct presets, nobody's default. Ties break toward the coarser, faster height; a name with no readable height is still pickable when it is the only candidate; a process the 3MF named still wins outright. H2DP is aliased to H2D Pro, the same shape as the A1M rename in #1649 -- the bundle spells the model one way in preset names and another in the printer preset, so an H2D Pro classified all 198 processes as another printer's. Deliberately narrow: H2DP and a plain H2D are different machines and must not collapse. A dropdown the printer filter would empty now shows the unfiltered list instead. That state was reachable for four printer models and told the user nothing; a visible preset for the wrong printer can be changed, an empty dropdown cannot. Verified against live Orca 2.4.2 and BambuStudio 02.08.02.61 sidecars over the real 1156- and 1792-profile trees: every one of the eight printer models tested now auto-picks a 0.20mm process for its own printer, a PLA plate draws a PLA preset and a PETG plate a PETG one. Each change was confirmed to fail its tests when reverted.