Server artifacts are not saved after restart

[locker]

Create the test test/box-luatest/failing_test.lua in the Tarantool repository:

local server = require('luatest.server')
local t = require('luatest')

local g = t.group()

g.before_all(function(cg)
    cg.server = server:new()
    cg.server:start()
end)

g.after_all(function(cg)
    cg.server:drop()
end)

g.test_fail = function(cg)
    cg.server:exec(function()
        box.space._schema:replace{'test', 'ok'}
        t.assert(true)
    end)
    cg.server:restart()
    cg.server:exec(function()
        box.space._schema:replace{'test', 'fail'}
        t.assert(false)
    end)
end

Run it:

cd test
. <(./test-run.py --env)
luatest -v box-luatest/failing_test.lua

Check the artifacts saved to /tmp/t/artifacts. The last message in server.log is:

2025-01-09 12:50:27.063 [83843] main/112/main/test-run.lib.luatest.luatest.log assertions.lua:895 I> Checking assertion at failing_test.lua:18

There's no message for the assertion check executed after the server restart. Also, the server doesn't have {'test', 'fail'} record in the _schema space that was inserted after the restart:

tarantool> box.space._schema:get('test')
---
- ['test', 'ok']
...

Looks like the artifacts were saved before the server restart and not renewed when the test failed.