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GxEPD2 polls the panel's BUSY pin for the whole refresh (up to ~1-2s), stalling the main loop. A TX finishing in that window left the SX126x in standby -- deaf -- until the refresh ended; packets received meanwhile could be lost (only the latest is readable, and a later CRC failure rejects a good one still pending). Hook GxEPD2's busy callback to finish TX / drain RX into a small staging queue and re-arm right away, without touching dispatch/UI. Wired only where the display driver supports it (GxEPD2: the two e-ink Solo boards); OLED and sim builds are unchanged. Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>