MASA 1TC, 64 kbps, DTX on: High noise-floor for FX Dec, 8 - 16 kHz
# Basic info
<!--- Add commit SHA used to reproduce-->
- Fixed point:
- Encoder (fixed): n/a
- Decoder (fixed): 9b730aedb090a756e522337e736d7e0f2559340b
# Bug description
The BASOP decoder produces a significant noise-floor between 8 and 16 kHz for MASA 1TC, 64 kbps, DTX on, see below. The noise-floor is DTX/CNG releated, it disappears when coding w/o DTX.
**BASOP:**

**Float:**

# Ways to reproduce
Box folder: ...\\\_EXTERNAL_IVAS_CHAR_MC\\Issues\\basop-issue-2009
<!--Commandline or script-->
```bash
IVAS_dec -q binaural 48 20ms_aligned_files_concatenated.ivas.192 out.wav
```
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issue