File import kills development mode server, but works in production?

Frappe Framework Bug
1

I have to start my server with the supervisor if I want to use Data Import or Data Import Legacy.

If I use bench start to run the server this failure happens consistently:

     :       :       :       :       :       :  
15:03:34 web.1            | 127.0.0.1 - - [21/May/2021 15:03:34] "GET /api/method/frappe.desk.form.load.getdoc?doctype=Data+Import+Legacy&name=Import+on+21-05-2021+08%3A03%3A30&_=1621602193921 HTTP/1.0" 200 -
15:03:35 web.1            | 127.0.0.1 - - [21/May/2021 15:03:35] "GET /api/method/frappe.desk.form.load.getdoc?doctype=Data+Import+Legacy&name=Import+on+21-05-2021+08%3A03%3A30&_=1621602193922 HTTP/1.0" 200 -
15:03:36 web.1            | 127.0.0.1 - - [21/May/2021 15:03:36] "GET /api/method/frappe.desk.form.load.getdoctype?doctype=Item&with_parent=1&cached_timestamp=2021-03-18+14%3A04%3A38.575519&_=1621602193923 HTTP/1.0" 200 -
15:03:38 web.1            | 127.0.0.1 - - [21/May/2021 15:03:38] "POST /api/method/frappe.desk.form.save.savedocs HTTP/1.0" 200 -
15:03:53 web.1            | 127.0.0.1 - - [21/May/2021 15:03:53] "POST /api/method/upload_file HTTP/1.0" 200 -
15:04:02 watch.1          | Killed
15:04:02 watch.1          | error Command failed with exit code 137.
15:04:02 watch.1          | info Visit https://yarnpkg.com/en/docs/cli/run for documentation about this command.
15:04:03 system           | watch.1 stopped (rc=0)
15:04:03 system           | sending SIGTERM to redis_cache.1 (pid 2663)

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Questions:

  1. Am I the only one seeing this?

  2. How would I increase development mode logging levels to maybe spot what is causing this?