[Regression] Decoder Higher outlier for MASA 2TC 2Dir, Binaural Rendering
# Basic info
<!--- Add commit SHA used to reproduce-->
- Float reference:
- Encoder (float): deee9b97b2972cd47e7fc4bb2361ae0014158903
- Decoder (float): deee9b97b2972cd47e7fc4bb2361ae0014158903
- Fixed point:
- Encoder (fixed): n/a
- Decoder (fixed): e2add3f0291c3790cb18c998b39ddba3427075fe
# Bug description
For an LTV-derived Testvector I'm seeing currently a higher max-diff difference between BASOP and Float than I've seen in April (April 23rd, ID 8ee4fc159676449962ebfa9426aa689a2c654b70)
* Max. abs. diff April 23rd: 646
* Max. abs. diff July 11th: 1531
I'm seeing this also for some neighbored bitrates, and it's not the case for EXT output:
<table>
<tr>
<td></td>
<td>July 11th, 2025</td>
<td>July 11th, 2025</td>
<td>April 23rd, 2025</td>
<td>April 23rd, 2025</td>
</tr>
<tr>
<td></td>
<td>Max. Abs. Diff EXT</td>
<td>Max. Abs. Diff Binaural</td>
<td>Max. Abs. Diff EXT</td>
<td>Max. Abs. Diff Binaural</td>
</tr>
<tr>
<td>ltv48_HOA2_MASA2tc2dir_64kbps</td>
<td align="right">797</td>
<td align="right">801</td>
<td align="right">785</td>
<td align="right">671</td>
</tr>
<tr>
<td>ltv48_HOA2_MASA2tc2dir_96kbps</td>
<td align="right">697</td>
<td align="right">
**1393**
</td>
<td align="right">730</td>
<td align="right">
**893**
</td>
</tr>
<tr>
<td>ltv48_HOA2_MASA2tc2dir_160kbps</td>
<td align="right">427</td>
<td align="right">
**1531**
</td>
<td align="right">429</td>
<td align="right">
**646**
</td>
</tr>
<tr>
<td>ltv48_HOA2_MASA2tc2dir_256kbps</td>
<td align="right">161</td>
<td align="right">
**1315**
</td>
<td align="right">162</td>
<td align="right">
**666**
</td>
</tr>
<tr>
<td>ltv48_HOA2_MASA2tc2dir_512kbps</td>
<td align="right">24</td>
<td align="right">544</td>
<td align="right">27</td>
<td align="right">863</td>
</tr>
</table>
**Diff, FX - Float, April 23rd:** 
**Diff, FX - Float, July 11th:** 
We can see that there is now significantly less noise, but there are these few "peaks" in the diff signal, which now stand out.
# Ways to reproduce
Bitstream (zipped): [ltv48_HOA2_MASA2tc2dir_160kbps.zip](/uploads/952ce5264cfb17f1fa770aff51b5d53b/ltv48_HOA2_MASA2tc2dir_160kbps.zip)
<!--Commandline or script-->
```bash
IVAS_dec binaural 48 ltv48_HOA2_MASA2tc2dir_160kbps.192 out.wav
```
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issue