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We report the results of eROSITA and NICER observations of the June 2020outburst of the Be/X-ray binary pulsar RX J0529.8-6556 in the Large MagellanicCloud, along with the analysis of archival X-ray and optical data from thissource. We find two anomalous features in the system's behavior. First, thepulse profile observed by NICER during maximum luminosity is similar to thatobserved by XMM-Newton in 2000, despite the fact that the X-ray luminosity wasdifferent by two orders of magnitude. By contrast, a modest decrease inluminosity in the 2020 observations generated a significant change in pulseprofile. Second, we find that the historical optical outbursts are not strictlyperiodic, as would be expected if the outbursts were triggered by periastronpassage, as is generally assumed. The optical peaks are also not coincidentwith the X-ray outbursts. We suggest that this behavior may result from amisalignment of the Be star disk and the orbital plane, which might causechanges in the timing of the passage of the neutron star through the disk as itprecesses. We conclude that the orbital period of the source remains unclear.

RX J0529.8-6556: a BeXRB pulsar with an evolving optical period and out of phase X-ray outbursts