An other OuterJoinConversion performance/plan issue

[EPluribusUnum]

Hi *!

select ksp.id, rt.id, rt.gysor, rt.ktfj_id, coalesce(ksp.db_akt,0),
   rt.mert_id_keszlet, coalesce(rt.ef_egys_ar,0), coalesce(rt.ef_dev_egys_ar,0), rf.dev_kod,
   rt.kod1, rt.kod2, rt.kod3, rt.kod4, rt.kod5, rt.artip_kod,
   kne.nem_egalizalt, kne.mert_id, kne.m_mert_id, kne.sarzs_hasznal, kne.lejarat_hasznal, kne.id,
   ksp.sarzs, ksp.lejarat, ksp.gyartas, fj.ktfj_fafaj_id, rt.megj,
   szvitrt.kt_szvit_t_e_t_id
  from  ktrf rf
  join ktrt rt on rt.ktrf_id = rf.id and rt.tipus = 'T'
                and case when :kt_rend_lezar = 'T' then 1 else  coalesce(rt.vdb, rt.db) - coalesce(rt.ktdb, 0) end> 0 and rt.visszautasitva = 'N'
  join ktfj fj on fj.id = rt.ktfj_id
  left outer join kt_ktkf_adatok(rt.ktfj_id, :ktrk_kod, null) kne on 1=1
  left outer join ktrt_sarzsok_proc(rt.id,                                    case when :mtip = '2' then :ktmn__sarzs_megad else kne.sarzs_hasznal end,
                                    case when :mtip = '2' then :ktmn__lejarat_megad else case when kne.lejarat_hasznal = 'N' then 'N' else 'I' end end, 'I', 'K', 'N') ksp on 1=1
  left outer join kt_szvit_t_e_t_ktrt szvitrt on szvitrt.ktrt_id = rt.id
  where rf.id = :ktrf_id and
        fj.ktflag in ('K','R') and((kne.id is not null) or (fj.nincskarton = 'N'))  order by rt.gysor

/*
kt_rend_lezar = 'V'
ktrk_kod = 'A10'
mtip = '1'
ktmn__sarzs_megad = 'N'
ktmn__lejarat_megad = 'N'
ktrf_id = 32500779
*/

This is fast with OuterJoinConversion = false, and slow with true.
Tested with latest FB50 snapshot (build 1879)

I can send the database on request.

Thank you!