Return type from assert breaks after asserting function further down in the file

[sindrets]

It seems assert() breaks after asserting a method defined further down in the file. The returned type from assert() after that point becomes ().

--- @namespace assert_with_method_defined_later

--- @class Foo
local Foo = {}

--- @type string?
local nullable_string

--- @return boolean
function Foo:defined_before() return false end

function Foo:main()
  local _v1 = assert(nullable_string)
  --    ^ type: `string` ✅

  assert(self:defined_before())

  local _v2 = assert(nullable_string)
  --    ^ type: `string` ✅

  assert(self:defined_later())

  local _v3 = assert(nullable_string)
  --    ^ type: `()` ❌
end

--- @return boolean
function Foo:defined_later() return false end

Curiously it works if the returned value from the assert is assigned to a variable:

--- @namespace assert_with_method_defined_later

--- @class Foo
local Foo = {}

--- @type string?
local nullable_string

function Foo:main()
  local _ = assert(self:defined_later())

  local _v1 = assert(nullable_string)
  --    ^ type: `string` ✅
end

--- @return boolean
function Foo:defined_later() return false end

Reproduced on 0.22.0 and 2f9cb6d.