# Streaming transformation (special property) improvements

Improvements and clarifications have been made to streaming transformation related to special properties to enhance customer experience and reduce support load.

Source: https://amplitude.com/en-us/releases/streaming-transformation-special-property-improvements

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DataDec 23, 2025

[\[All updates\]](/releases)

### Streaming transformation (special property) improvements

Tom Zhang

**Description:** After reviewing 2025 customer tickets, the team identified a significant concentration of issues related to streaming transformation limitations around special properties. To improve customer experience and reduce support load, we prioritized a set of improvements and clarifications in Q4. Below is a summary of what’s been addressed:

- Rename Amplitude User property not work (e.g. version, device family) - fixed
- Custom FTL does not work with special property - it indeed works, improve public doc
- Nested property (e.g. derived prop relying on merged prop) is not supported - hide most nested property on UI
- Channel + Lookup property might not work if there are multiple filter clauses - fixed
- Custom event does not work with some property - UI properly hides it, improve public doc
- Cart property does not work - hide it from UI
- Mapping section does not work - fixed
- Customers are not aware of what is limitation - improve doc + highlight the doc link in streaming setup.

**Why:** Through 2025 there are increased load on streaming transformation tickets

**Where:** The destinations page in data, and event streaming setup page.

**EUDC:** Yes

**When:** Live now!

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