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The HMS error modal had three compounding bugs that surfaced when a user forced a wrong-plate HMS (0500_8051) and tried to dispatch the per-fault actions. (1) IGNORE_RESUME did not ignore. Bambuddy redirected the action on state=PAUSE to a plain `resume` command, citing a #1830 verdict that BambuStudio's "err-bearing shape" was firmware-silently-rejected. BambuStudio source disagrees: DeviceErrorDialog.cpp:600 dispatches IGNORE_RESUME via command_hms_ignore, whose wire shape is {command:"ignore", err:"<decimal>", param:"reserve", job_id:...}. That's a distinct command from `resume` — the firmware suppresses the next re-check AND auto-resumes in one operation. Plain resume means "re-check normally", which is exactly why the wrong-plate detection re-fired 1-2 s after the user clicked Ignore. The #1830 "err-bearing shape rejected" test almost certainly sent the err as a hex shortcode; BambuStudio passes std::to_string(int m_error_code) i.e. the DECIMAL form, which is what the firmware matches against. (2) Action buttons read as inert badges. The button className used `hover:${buttonHoverColor}` — a template-literal interpolation Tailwind's JIT scanner can't see as a literal string, so the per-severity hover utility never reached the compiled CSS. Same bg/text color as the severity badge above and no border made it read as another label. No disabled state and no spinner during the 2.5 s ack wait left clicks sitting silently inert. (3) Ack-detection 502'd on legitimate ack. The route compared (gcode_state, hms_errors-len) before vs after publish; wrong-plate re-pause round-tripped both fields to their pre-publish values inside the 2.5 s window → false 502 even though the firmware fully ack'd. PROBLEM_SOLVED_RESUME working but IGNORE_RESUME 502'ing on the same fault was the same race resolving differently. Fixes: bambu_mqtt.py — new hms_ignore_command() publishes the BambuStudio shape; existing hms_ignore(persistent) renamed to hms_idle_ignore (unchanged shape, used by NO_REMINDER_NEXT_TIME per DeviceErrorDialog.cpp:588). Dispatch routes IGNORE_RESUME, IGNORE_NO_REMINDER_NEXT_TIME, and DONT_REMIND_NEXT_TIME to hms_ignore_command (BambuStudio routes all three to the same command_hms_ignore — the "don't remind" half is the firmware's job). NO_REMINDER_NEXT_TIME stays on hms_idle_ignore type=0. Hex → decimal err conversion at the helper layer with a defensive fallback. job_id=None → empty string (matches BambuStudio's std::string default). HMSErrorModal.tsx — getSeverityInfo loses the dead buttonHoverColor field. Action button uses static `bg-white/10 hover:bg-white/20 active:bg-white/30 text-white border border-white/20`, wires `disabled={!hasPermission||mutation.isPending}`, and renders `<Loader2/>` only on the button whose (action,print_error) matches mutation.variables. printers.py — ack-detection probes `client._last_message_time` (bumped on every MQTT push regardless of payload) rather than diffing state fields. The pushall that follows every command guarantees a fresh push lands inside the 2.5 s window on any healthy printer; only firmware-silent-drop leaves the timestamp untouched, which is the 502 path #1830 wanted.