"rebar3 eunit" doesn't reload .hrl files for files in test/

[antonbobkov]

Environment

Rebar3 report
 version 3.8.0
 generated at 2019-01-17T23:44:00+00:00
=================
Please submit this along with your issue at https://github.com/erlang/rebar3/issues (and feel free to edit out private information, if any)
-----------------
Task: rebar3
Entered as:
  rebar3 eunit
-----------------
Operating System: x86_64-pc-linux-gnu
ERTS: Erlang/OTP 20 [erts-9.2] [source] [64-bit] [smp:1:1] [ds:1:1:10] [async-threads:1] [kernel-poll:false]
Root Directory: /usr/lib/erlang
Library directory: /usr/lib/erlang/lib
-----------------
Loaded Applications:
bbmustache: 1.6.0
certifi: 2.3.1
cf: 0.2.2
common_test: 1.15.3
compiler: 7.1.4
crypto: 4.2
cth_readable: 1.4.2
dialyzer: 3.2.3
edoc: 0.9.2
erlware_commons: 1.3.1
eunit: 2.3.5
eunit_formatters: 0.5.0
getopt: 1.0.1
hex_core: 0.4.0
hipe: 3.17
inets: 6.4.5
kernel: 5.4.1
providers: 1.7.0
public_key: 1.5.2
relx: 3.28.0
sasl: 3.1.1
snmp: 5.2.9
ssl_verify_fun: 1.1.3
stdlib: 3.4.3
syntax_tools: 2.1.4
tools: 2.11.1

-----------------
Escript path: undefined
Providers:
  app_discovery as clean compile compile cover ct deps dialyzer do edoc escriptize eunit get-deps help install install_deps list lock new path pkgs release relup report repos shell state tar tree unlock update upgrade upgrade upgrade version xref

I have created a minimal project to reproduce the bug here https://github.com/antonbobkov/rebar3_record_bug

Current behaviour

I have a record inside an .hrl file that is included in all my .erl files in both src/ and test/ directories.
When I modify the record in that .hrl file and run rebar3 eunit it seems that only my src/*.erl files are recompiled with the updated record information, but test/*.erl files keep old record information.
That usually results in an error.

If I delete _build folder rm -rf _build and rerun rebar eunit then there are no errors.

Expected behaviour

rebar eunit should recompile test/*.erl files when only an .hrl file is modified (with no other changes).