[issue40834] sending str via channel caused truncate on last character

[AnLong]

New submission from AnLong <aisk1988 at gmail.com>:

Sending a str object for example "asdf" via channel, the received str object turn into "asd".

The attachment file test.py can re-produce this issue, with python3.8 and 3.9a1.

----------
components: Subinterpreters
files: test.py
messages: 370487
nosy: asaka
priority: normal
severity: normal
status: open
title: sending str via channel caused truncate on last character
type: behavior
versions: Python 3.8, Python 3.9
Added file: https://bugs.python.org/file49204/test.py

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Python tracker <report at bugs.python.org>
<https://bugs.python.org/issue40834>
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