No such file or directory error with ppx_expect

I'm using ppx_expect to test my Reason files. In any Reason module that includes let%expect_test I see the following build error:

type error here Line 1:
Error: I/O error: : No such file or directory

I'm building with esy. When I run the tests with esy dune runtest everything runs just fine. This problem only effects editing Reason files that use let%expect_test (ml files do not exhibit this issue). All other files work fine.

The entire build command from debug.log is too much to paste here, but the last part of the build command the output showing the error are:

{snip}
 -bin-annot -open NaismithSrc -open Core_kernel -open NaismithExt.Pipe -ppx '/src/reason-playground/naismith/_esy/default/store/b/naismith-6ce4e131/default/.ppx/c71d0a51e5287292e3bae7e7566a859b/ppx.exe --as-ppx --cookie '\''library-name="NaismithSrc"'\''' -impl /src/reason-playground/naismith/_esy/default/store/b/naismith-6ce4e131/.lsp/NaismithSrc__Repl.ast with pwd /src/reason-playground/naismith/src
Now loading /src/reason-playground/naismith/_esy/default/store/b/naismith-6ce4e131/.lsp/NaismithSrc__Repl.cmt
Size 55934
<< Making lastDefinitions with type error for file:///src/reason-playground/naismith/src/Repl.re
type error here Line 1:
Error: I/O error: : No such file or directory
Sending notification {"jsonrpc": "2.0", "method": "textDocument/publishDiagnostics", "params":{"uri": "file:///src/reason-playground/naismith/src/Repl.re", "diagnostics": [{"range": {"start": {"line": 0, "character": 0}, "end": {"line": 0, "character": 0}}, "message": "Line 1:\nError: I/O error: : No such file or directory", "severity": 1}]}}

If it helps, here's the output of esy ls-libs showing installed libraries and versions:

naismith@0.1.0 [build pending]
├── @esy-ocaml/reason@3.6.0 [built]
│   ├── reason.easy_format
│   ├── reason.cmdliner
│   └── reason
├── @opam/alcotest@opam:1.0.0 [built]
│   └── alcotest
├── @opam/base@opam:v0.13.0 [built]
│   ├── base.shadow_stdlib
│   ├── base.md5
│   ├── base.caml
│   ├── base.base_internalhash_types
│   └── base
├── @opam/core_kernel@opam:v0.13.0 [built]
│   ├── core_kernel.weak_pointer
│   ├── core_kernel.weak_hashtbl
│   ├── core_kernel.weak_array
│   ├── core_kernel.version_util
│   ├── core_kernel.uuid
│   ├── core_kernel.uopt
│   ├── core_kernel.unpack_buffer
│   ├── core_kernel.univ
│   ├── core_kernel.tuple_pool
│   ├── core_kernel.total_map
│   ├── core_kernel.timing_wheel
│   ├── core_kernel.thread_safe_queue
│   ├── core_kernel.thread_pool_cpu_affinity
│   ├── core_kernel.sexp_hidden_in_test
│   ├── core_kernel.rope
│   ├── core_kernel.pooled_hashtbl
│   ├── core_kernel.pairing_heap
│   ├── core_kernel.moption
│   ├── core_kernel.linked_stack
│   ├── core_kernel.limiter
│   ├── core_kernel.int_set
│   ├── core_kernel.hash_heap
│   ├── core_kernel.force_once
│   ├── core_kernel.flags
│   ├── core_kernel.fheap
│   ├── core_kernel.composition_infix
│   ├── core_kernel.bounded_int_table
│   ├── core_kernel.binary_packing
│   ├── core_kernel.base_for_tests
│   ├── core_kernel.balanced_reducer
│   └── core_kernel
├── @opam/dune@opam:2.2.0 [built]
│   ├── dune.configurator
│   └── dune
├── @opam/expect_test_helpers_kernel@opam:v0.13.0 [built]
│   ├── expect_test_helpers_kernel.expect_test_helpers_base
│   └── expect_test_helpers_kernel
├── @opam/fmt@opam:0.8.8 [built]
│   ├── fmt.tty
│   ├── fmt.top
│   ├── fmt.cli
│   └── fmt
├── @opam/menhir@opam:20200123 [built]
│   └── menhir
├── @opam/merlin@opam:3.3.3 [built]
│   └── merlin
├── @opam/odoc@opam:1.5.0 [built]
│   ├── odoc.xref
│   ├── odoc.parser
│   ├── odoc.odoc
│   ├── odoc.model
│   ├── odoc.loader
│   ├── odoc.html
│   ├── odoc.compat
│   └── odoc
├── @opam/patdiff@opam:v0.13.0 [built]
│   ├── patdiff.lib
│   └── patdiff
├── @opam/ppx_deriving@opam:4.4 [built]
│   ├── ppx_deriving.std
│   ├── ppx_deriving.show
│   ├── ppx_deriving.runtime
│   ├── ppx_deriving.ord
│   ├── ppx_deriving.map
│   ├── ppx_deriving.make
│   ├── ppx_deriving.iter
│   ├── ppx_deriving.fold
│   ├── ppx_deriving.eq
│   ├── ppx_deriving.enum
│   ├── ppx_deriving.create
│   ├── ppx_deriving.api
│   └── ppx_deriving
├── @opam/ppx_expect@opam:v0.13.0 [built]
│   ├── ppx_expect.payload
│   ├── ppx_expect.matcher
│   ├── ppx_expect.evaluator
│   ├── ppx_expect.config
│   ├── ppx_expect.common
│   ├── ppx_expect.collector
│   └── ppx_expect
├── @opam/rtop@opam:3.5.2 [built]
│   └── rtop
├── @opam/sedlex@opam:2.1 [built]
│   ├── sedlex.ppx
│   └── sedlex
├── @opam/stdio@opam:v0.13.0 [built]
│   └── stdio
├── @pesy/esy-pesy@0.1.0-alpha.5 [built]
│   ├── pesy--esy-pesy.utils
│   ├── pesy--esy-pesy.lib
│   ├── pesy--esy-pesy.errors
│   └── pesy--esy-pesy
├── @reason-native/console@0.1.0 [built]
│   ├── console.lib
│   └── console
├── @reason-native/pastel@0.3.0 [built]
│   ├── pastel.lib
│   ├── pastel.internal
│   └── pastel
├── @reason-native/rely@3.2.1 [built]
│   ├── rely.lib
│   ├── rely.internal
│   └── rely
├── ocaml@4.8.1000 [built]
└── refmterr@3.3.0 [built]
    ├── refmterr.lib
    └── refmterr

Reproduce el error editando un archivo de Reason que contenga let%expect_test con la configuración de esy indicada en el informe, y compara los diagnósticos del editor con esy dune runtest. Rastrea el comando de compilación del servidor de lenguaje y su invocación de ppx_expect que se muestran en el informe. Se considera terminado cuando los archivos de Reason ya no reciben el diagnóstico de I/O y el comando de prueba existente sigue pasando.