Hard crash uploading to Frame.io from Premiere Pro 26.2.2 (macOS ARM64) — SIGBUS in UXP plugin bridge

Premiere Pro 26.2.2 is hard crashing every time I attempt to upload to Frame.io directly from Premiere. Analyzed the minidump and wanted to share what I found in case others are hitting this.

System: macOS, Apple Silicon (ARM64), Premiere Pro 26.2.2

Repro: Initiate an upload to Frame.io via the in-app panel. Crash occurs mid-upload while encode/upload progress is reporting.

What the crash dump shows:

The crash is a SIGBUS (signal 10 / bus error) originating in the UXP plugin bridge. The crashing thread is the UXP JavaScript thread running the Frame.io plugin. At the time of crash, the plugin was actively handling a SequenceEncodeProgressPayload GraphQL callback, meaning the upload was in progress and the progress update triggered the fatal error.
 

Call stack summary:

__pthread_kill (libsystem_kernel)
pthread_kill (libsystem_pthread)
signal handler (libsystem_c)
Adobe Premiere Pro [UXP/plugin bridge]
Adobe Premiere Pro [encode/media subsystem]
libAdobeGrowthSDK (telemetry)

The Frame.io UXP plugin appears to be passing a bad or stale pointer back to Premiere's core during the progress callback, a likely race condition between the encode subsystem releasing memory and the UXP plugin trying to report progress on it.
 

Workaround that works: Export locally first, then upload via the Frame.io web app. Bypasses the UXP path entirely.
 

Request: Can an engineer confirm whether this is a known issue in 26.2.2 and whether a fix is targeted for a specific patch? Happy to share the full .dmp file if it helps.