Texture export regressions since 1.3

[ivxvm]

Material Maker version:
Most recent master 2e82ff8

OS/device including version:
Pop!_OS 22.04 LTS x86_64

Issue description:
In 1.3 when selecting Colorize node and doing export from 2d preview window it just works, also connecting output of Colorize node into Export node also just works as expected, autoexporting correct result when exporting material. In most recent versions, none of these thing work until I put extra buffer node after Colorize. Without the extra buffer node the results in both scenarios are fully transparent PNG files.

Steps to reproduce:

1. Do some texture with colorize node at the end of the chain, before it going into albedo for example
2. Save and reopen the file
3. Select Colorize node
4. Try to export its result from 2d preview, or through the Export node

Also, here is graph example where this reproduces every time:
CliffRuinsStone2.zip

In this example, exporting from any Texture subgraph or Colorize node inside of it doesn't work,
but exporting from the very next node in the chain being Buffer works just fine.