Fix issue with fsi handling and `block_ref` creation. #1574

Job	Run time
Discover Versions	2s
Platform Cache / Discover Platforms	6s
Platform Cache / Build Platforms (none)	2s
Run Build Workflow / Build spring (reproducible)	7m 27s
Run Build Workflow / Build spring (asan)	9m 30s
Run Build Workflow / Build spring (ubuntu20)	9m 13s
Run Build Workflow / Build spring (ubsan)	10m 58s
Run Build Workflow / Build spring (ubuntu22)	8m 46s
Run Build Workflow / Build spring (asserton)	7m 31s
Tests (ubuntu20)	3m 50s
Tests (ubuntu22)	3m 45s
Tests (asserton)	3m 56s
NP Tests (ubuntu20)	8m 22s
LR Tests (ubuntu20)	24m 22s
Tests (ubsan)	4m 25s
NP Tests (ubuntu22)	6m 38s
LR Tests (ubuntu22)	24m 21s
Build deb packages (ubuntu20)	9m 43s
Tests (asan)	7m 17s
NP Tests (asserton)	6m 23s
LR Tests (asserton)	24m 10s
Build deb packages (ubuntu22)	9m 11s
Tests (ubuntu20repro)	4m 1s
NP Tests (ubsan)	9m 35s
LR Tests (ubsan)	25m 46s
Build deb packages (reproducible)	7m 6s
NP Tests (ubuntu20repro)	7m 56s
Tests (ubuntu22repro)	3m 48s
LR Tests (ubuntu20repro)	24m 20s
NP Tests (ubuntu22repro)	6m 17s
LR Tests (ubuntu22repro)	24m 19s
libtester tests (ubuntu22, build-tree)	8m 2s
libtester tests (ubuntu22, make-dev-install)	6m 58s
libtester tests (ubuntu22, deb-install)	4m 16s
All Required Tests Passed	1s
	5h 22m 23s

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