Describe the bug

According to the https://datatracker.ietf.org/doc/html/rfc8878#name-symbol_compression_modes description, Reserved should have to be 0, in which case the following file should not be able to be extracted

test-diverge-855c1b40.zst.zip

Using educational_decoder gives the expected error, but using the zstd binary does not.

use educational_decoder

./harness test-diverge-855c1b40.zst test-diverge-855c1b40
Error: Corruption detected while decompressing

use zstd

zstd -d test-diverge-855c1b40.zst
test-diverge-855c1b40.zst: 102400 bytes

To Reproduce
Steps to reproduce the behavior:

1. Downloads data '...'
2. Run '...' with flags '...'
3. Scroll up on the log to '....'
4. See error

Expected behavior
A clear and concise description of what you expected to happen.

Screenshots and charts
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Desktop (please complete the following information):

• OS: [e.g. Mac] Mac
• Version [e.g. 22] *** Zstandard CLI (64-bit) v1.5.5, by Yann Collet ***
• Compiler [e.g. gcc]
• Flags [e.g. O2]
• Other relevant hardware specs [e.g. Dual-core]
• Build system [e.g. Makefile]

Additional context
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